Combine sugar, egg yolks and Marsala wine in a bowl. Place over a double broiler and whip rapidly until mixture peaks. Remove from double broiler and let stand. Whip the heavy cream until it peaks. Slowly fold the whipped cream into Marsala custard mixture. When complete, refrigerate for 1 hour. Rim red wine glasses with sugar. Clean and stem strawberries. Place berries in the wine glass, and pour Zabaglione over the top. Garnish with berries and enjoy.